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CVE-2021-25217

Status Candidate

Overview

In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.

Related Files

Red Hat Security Advisory 2021-2555-01
Posted Jul 6, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2555-01 - Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This advisory contains the RPM packages for Red Hat OpenShift Container Platform 4.7.19. Issues addressed include buffer overflow and privilege escalation vulnerabilities.

tags | advisory, overflow, vulnerability
systems | linux, redhat
advisories | CVE-2021-25217, CVE-2021-3560
MD5 | a8159dbed5510646d51e3ed2b7674723
Red Hat Security Advisory 2021-2519-01
Posted Jun 22, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2519-01 - The redhat-virtualization-host packages provide the Red Hat Virtualization Host. These packages include redhat-release-virtualization-host. Red Hat Virtualization Hosts are installed using a special build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks. Issues addressed include buffer overflow, integer overflow, and privilege escalation vulnerabilities.

tags | advisory, overflow, vulnerability
systems | linux, redhat
advisories | CVE-2020-24489, CVE-2021-25217, CVE-2021-27219
MD5 | b765519eb1dded8feec387e980f06c72
Red Hat Security Advisory 2021-2469-01
Posted Jun 17, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2469-01 - The Dynamic Host Configuration Protocol is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow, protocol
systems | linux, redhat
advisories | CVE-2021-25217
MD5 | b8a126d5e00e78169cf7a064daca3dbe
Red Hat Security Advisory 2021-2420-01
Posted Jun 15, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2420-01 - The Dynamic Host Configuration Protocol is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow, protocol
systems | linux, redhat
advisories | CVE-2021-25217
MD5 | 80fc02746735c3bebe00db19e40e6fdc
Red Hat Security Advisory 2021-2419-01
Posted Jun 15, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2419-01 - The Dynamic Host Configuration Protocol is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow, protocol
systems | linux, redhat
advisories | CVE-2021-25217
MD5 | 33054296c8f78f8ff7e882eccb72e37b
Red Hat Security Advisory 2021-2416-01
Posted Jun 15, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2416-01 - The Dynamic Host Configuration Protocol is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow, protocol
systems | linux, redhat
advisories | CVE-2021-25217
MD5 | a04ccc2e870f084ea8f2b06b306eea49
Red Hat Security Advisory 2021-2414-01
Posted Jun 15, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2414-01 - The Dynamic Host Configuration Protocol is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow, protocol
systems | linux, redhat
advisories | CVE-2021-25217
MD5 | 8101e1bc6e426345f3b9239caa0409a9
Red Hat Security Advisory 2021-2415-01
Posted Jun 15, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2415-01 - The Dynamic Host Configuration Protocol is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow, protocol
systems | linux, redhat
advisories | CVE-2021-25217
MD5 | fbb70c291ae1b082475c99812afc098c
Red Hat Security Advisory 2021-2418-01
Posted Jun 15, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2418-01 - The Dynamic Host Configuration Protocol is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow, protocol
systems | linux, redhat
advisories | CVE-2021-25217
MD5 | 7ab1238cc5d9bd01bc164cda6c4731b8
Red Hat Security Advisory 2021-2405-01
Posted Jun 14, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2405-01 - The Dynamic Host Configuration Protocol is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow, protocol
systems | linux, redhat
advisories | CVE-2021-25217
MD5 | 7cf9277a347f3193f739de646103e6bc
Red Hat Security Advisory 2021-2359-01
Posted Jun 9, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2359-01 - The Dynamic Host Configuration Protocol is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow, protocol
systems | linux, redhat
advisories | CVE-2021-25217
MD5 | c64b443c25452b77860e8c0a3d020ce1
Red Hat Security Advisory 2021-2357-01
Posted Jun 9, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2357-01 - The Dynamic Host Configuration Protocol is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow, protocol
systems | linux, redhat
advisories | CVE-2021-25217
MD5 | c94e8ab8e9cfb18d1b038df68cd62ce4
Ubuntu Security Notice USN-4969-2
Posted May 27, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4969-2 - USN-4969-1 fixed a vulnerability in DHCP. This update provides the corresponding update for Ubuntu 14.04 ESM and 16.04 ESM. Jon Franklin and Pawel Wieczorkiewicz discovered that DHCP incorrectly handled lease file parsing. A remote attacker could possibly use this issue to cause DHCP to crash, resulting in a denial of service. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2021-25217
MD5 | 3dea7da9c9ee1a799585b2a234e1c84b
Ubuntu Security Notice USN-4969-1
Posted May 27, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4969-1 - Jon Franklin and Pawel Wieczorkiewicz discovered that DHCP incorrectly handled lease file parsing. A remote attacker could possibly use this issue to cause DHCP to crash, resulting in a denial of service.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2021-25217
MD5 | eea0d00a7d6e633d48ce49f82d3cc8f6
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